refactor: remove KI-Agent chat widget and backend route

backend/src/index.ts

@@ -14,7 +14,6 @@ import leaderboardRouter from './routes/leaderboard';
 import adminRouter from './routes/admin';
 import profileRouter from './routes/profile';
 import devRouter from './routes/dev';
-import agentRouter from './routes/agent';
 
 const app = express();
 const PORT = parseInt(process.env.PORT ?? '3001');
@@ -96,16 +95,6 @@ app.use(
   })
 );
 
-// Rate limit für Agent-Chat (Claude API Calls sind kostenpflichtig)
-app.use(
-  '/api/agent',
-  rateLimit({
-    windowMs: 60 * 1000, // 1 Minute
-    max: 10,             // 10 Chat-Nachrichten pro User/Minute
-    message: { error: 'Too many agent requests, bitte kurz warten.' },
-  })
-);
-
 // ============================================================
 // Health Check (ohne Auth – für Railway/Render/Uptime-Monitoring)
 // ============================================================
@@ -137,7 +126,6 @@ app.use('/api/tips', tipsRouter);
 app.use('/api/leaderboard', leaderboardRouter);
 app.use('/api/admin', adminRouter);
 app.use('/api/profile', profileRouter);
-app.use('/api/agent', agentRouter);
 if (process.env.NODE_ENV === 'development') {
   app.use('/api/dev', devRouter);
 }